Added nyc for test coverage

Author: mcibique

.babelrc

@@ -4,6 +4,18 @@
   ],
   "plugins": [
     "@babel/plugin-proposal-decorators",
-    ["@babel/plugin-proposal-class-properties", { "loose": true }]
-  ]
+    [
+      "@babel/plugin-proposal-class-properties",
+      {
+        "loose": true
+      }
+    ]
+  ],
+  "env": {
+    "test": {
+      "plugins": [
+        "istanbul"
+      ]
+    }
+  }
 }

.gitignore

@@ -18,3 +18,5 @@ yarn-error.log*
 *.ntvs*
 *.njsproj
 *.sln
+
+test/reports

.nycrc

@@ -0,0 +1,18 @@
+{
+  "include": [
+    "src/**/*.(js|vue)"
+  ],
+  "exclude": [
+    "src/**/*.spec.js",
+    "src/**/*.po.js",
+    "src/**/*.stub.js"
+  ],
+  "instrument": false,
+  "sourceMap": false,
+  "reporter": [
+    "html",
+    "text"
+  ],
+  "report-dir": "./test/reports",
+  "tempDirectory": "./test/reports/.nyc_output"
+}